Square-can-coating machine



Jan. 1, 1924 Y 1,479,683

- T.L.TAUAFERRO SQUARE CAN COATING MACHINE Filed til 6 1921 3Sheets-Sheet 1 T. L. TALIAFERRO SQUARE CAN COATING MACHINE Filed April1921 3 Sheets-Sheet 2 Jan. 1,19 1,479,683

' T. L. TALIAFERRO SQUARE CAN COATING MACHINE v Fi'i'ed April 6, 1921 3Shets-Sheet 5 @513 I WW Patented Jan. 1, 1924.

nrrso STATES THOMAS LUGIEN TALIAFERBO, OF CHICAGO, ILLINOIS.

SQUARE-CAN-COATING MACHINE.

Application filed April 6, 1921. Serial No. 459,073.

To all whom it may concern.

Be it known that I, THOMAS L. TALLA- rnano, a citizen of the UnitedStates, residing at Chicago, in the county of Cook, State of Illinois,have invented certain new and useful Improvements in Square-Can- CoatingMachines, of whichthe following is a description, reference being had tothe accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in machines forcoating covers for cans or the like with sealing ma terial, and moreparticularly to a cover that has straight sides and rounded corners.

An object of the invention is to provide a machine wherein the coatingis scraped on to the cover by the edge of the cover contacting with thecoating device or devices.

A further object of the invention is to provide a machine of the abovecharacter wherein opposite side edges of the cover are sin'iultaneouslycoated.

A still further object of the invention is to provide a machine of theabove type having parallel coating rolls which are con structed andmounted so that the curved corners of the cover are coated by the edgesthereof making scraping contact with the rolls as well as the straightsides of the cover.

A still further object of the invention is to provide a machine of theabove type wherein the cover is continuously progressed through themachine and all four sides and the rounded corners therebetween arecoated by scraping contact of their edges with the coating device ordevices.

These and other objects will in part be obvious and will in part behereinafter more fully disclosed.

In the drawings which show by Way of illustration one embodiment of thepresent i n venti on Figure 1 is a plant view showing a portion of amachine embodying my improve ments;

Fig. 2 is a veiw partly in side elevation and partly in section on theline 2-2 of Figure 1;

Fig. 3 is a diagrammatic view showing two of the coating rolls and thecover as it enters between the rolls and at the time when portions ofthe rounded corners are being coated;

Fig. 4 is a view similar to Fig. 3, but show ing the rolls as separatedto let the cover through, and the side edges as being coated; i

Fig. 5 is a view similar to Fig. 3, but showing the cover as leaving therolls and portions of the rounded ends at the opposite end of the coverbeing coated, and i Fig. 6 is a view showing the covers progressing in atransverse direction to its first direction of movement and beingreceived by the rolls which coat the remaining portions of the roundedcorners and the end portions of the cover.

The invention broadly consists in a machine for coating a cover for cansor the like, which cover has parallel side edges and parallel end edgeswith rounded corners therebetween. The cover is progressed continuouslythrough the machine while it is being coated and this is accomplishedpreferably by endless conveyors which engage the cover and move it firstin one direction and then in a direction at right angles thereto. Whilethe cover is being moved along its first path of movement, it is'presented to two coating rolls which are spaced and are yieldinglymounted. The ends of the rolls also are tapered and the rolls are so setthat the distances between their straight faces are less than the widthof the cover so that when the cover makes contact with the rolls, substantially half of the rounded corner sections will engage the taperedends of the rolls and the cover will force the rolls apart so as to passbetween them, and as the cover leaves the rolls, half of the oppositerounded corners will engage the tapered ends of the rolls at the rearthereof, after which the cover is transferred to the other conveyingmeans and is again presented to similarly mounted and positioned coatingrolls, which scrape the coating on to the ends of the cans and theremaining portions of the rounded corners. The cover travels in a planecontaining the axes of the coating rolls or substantially so, and theedge of the metal forming the-cover scrapes the coating material offfrom the roll. The thickness of the coating on the rolls is regulated by7 suitable means and the rolls, may, if desired, be corrugated so as tobreak up the coating surface of each roll.

Referring more in detail to the drawings, my improved coating machineconsists of a supporting framework 1 carrying a table 2. The cover isreceived by the endless conveyor, consisting as herein shown of asprocket chain 3 which runs over sprocket wheels 4 and 5. The sprocketwheel 4 is mounted on a shaft 6 carried by brackets 7, which in turn aremounted on the supporting table 2. The sprocket wheel is mounted inbrackets 8 which are likewise mounted on the table 2. The sprocket wheel5 is fixed to a shaft 9 which is driven by means of a bevel gear 10meshing with a bevel gear '11 on the short shaft 12. This short shaft 12carries a sprocket wheel 13 (see Fig. 2), over which runs a sprocketchain 14, which in turn meshes with a sprocket wheel 15 on the mainshaft 16. Said main shaft 16 is driven by a main sprocket drive 17 ofany suitable character. The shaft 16 is mounted in hangers 18, 18carried by the table 2.

This sprocket chain 3 runs in a slot 19 formed in a supporting plate 20on which the covers rest. One of the covers is indicated at C in thedrawings, another at C and still a third at C The sprocket chain 3 isprovided with a series of fingers 21. These fingers are preferablyarranged in pairs'and engage the rear edge of the cover to carry thesame along the supporting plate, the cover traveling in the directionof. the arrow indicated in Fig. 1. Mounted at opposite sides oftheguiding plate 20 are coating rolls 22 and 23. The coating roll 22 iscarried by a suitable shaft which projects into slotted brackets, one ofwhich is indicated at24 in Fig. 2 of the drawings. This bracket has ahorizontally disposed oblong slot which permits the shaft to move freelyback and forth in a horizontal direction. Mounted at one end of theshaft and adjacent the supporting bracket is a collar 25 which freelyengages the shaft. This collar carries a rod 26 which extends throughbearings 27, 27 carried by the bracket 24. A spring 28 located betweenone of the bearings 27 and the collar nor mally forces the roller towardthe center of the machine and toward the path of travel of the cover. Atthe other end of the shaft for the coating roll, there is a similarcollar 29 to which a rod 30 is attached which extends through a suitablebearing 31 in the supporting bracket for the shaft and a spring 32normally forces this collar and the left-hand end of the coating roll asviewed in Fig. 1, inwardly, so that the coating roll by the springs 28and 32 is normally pressed toward the dotted line position shown inFig. 1. The coating roll 23 is likewise mounted in brackets 33, each ofwhich is provided with a slot 34 in which the shaft 35 carrying thecoating roll 23 is mounted. On the shaft 35 and at the right-hand endthereof, as viewed in Fig. 1, there is a collar 36 carrying a rod 37sliding in suitable bearings, and a spring 38 is mounted on the rod andbears against the collar 36. At the other end of the shaft 35 there is acollar 39 carrying a rod 40 and spring 41 bears against the collar 39.These springs 38 and 41 normally press the coating roller 23 inwardlytoward the dotted line position. The supporting plate 20 has upwardlybent side members 42 and an end member 43 which form the receiving platform for the cover and serve to center the cover on the traveling chainso that when the lugs 21 pass through the slot in the supporting plate,which extends into the end flange 43, it will engage the cover and moveit forward from the dotted line position shown in Fig. 1, to the fullline position. This supporting plate 20 lies in a horizontal plane whichcontains the axes of the coating rolls, and as the cover is movedforward, its edges rolls, and the coating material on the rolls will bescraped on to the covers. The coating rolls 22 and 23 are tapered at 44,the receiving ends of the rolls, and are also tapered at 45, theopposite ends of the rolls. As above noted, the rolls are normally inthe dotted line position shown in Fig. 1, and as the cover approachesthe rounded corners, will engage the tapered end sections 44, 44 andwill gradually separate the rolls against the tension of the springsbearing thereon so that the cover passes between he rolls, and the rollswill be yieldingly pressed against the cover during the time it ispassing therebetween. Inasmuch as the edges of the cover will makecontact with the rolls, the coating material on. the

rolls will be scraped off on to the cover. The rounded corners at theforward end of the cover as more clearly shown in Fig. 3, make contactwith the rolls, first at the points 0, o, and the contact continues fromthis point around on to the side edges, and as the cover leaves therolls shown in Fig. 5, it will make contact with the rolls'around to thepoint 7), 7). It will, therefore, be noted that half of each roundedcorner makes contact with its respective coating roll which coats theside edges of the cover. 1

Associated with each coating roll is a trough 46 in which the coatingmaterial is placed. These troughs are of similar construction and eachis carried by lugs carried by bolts 47, 47 mounted for verticaladjustment in slots 48 inthe end brackets 24. Associated with each rollis a scraper or doctor 49. These scrapers are shaped to conform to alongitudinal section of the coating rolls. Each scraper is adjustablysecured at its ends to brackets provided with collars 50 which arefixedly secured to the rods at" tached to collars which move the roatingrolls yieldingly toward the center of the machine, and therefore, thescrapers or docwill engage the coating I illustrated in the drawings.

turn, of course, varies the amount of coat-' ing that is scraped on tothe cover as: -1t

passes along the rolls. The coating rolls as shown in the drawings, areprovided with a series of annular grooves 52. Thisvenables the film orcoating applied to the cover to be thinner or thicker, as desired, as itreduces the actual contact surface carrying the coating material. I havefound that by a roll shaped as above stated, fl. am'able to handle thecoating better than by the use of a straight surface roll, yet astraight surface roll may be used to advantage, and I do not desire tohave it understood that I am limited to the particular form of rollInstead of making the roll with a straight face and straight taperedends as shown in the drawings, it will be understood also that the rollmay be oval or otherwise shaped, the essential thing being that therolls shall be yield ingly mounted and so shaped as to make contact witha portion of the rounded corners as well as the straight. side of thecover.

The coating rolls 22 and 23 are positively rotated. On the end of theshaft 35 carrying the coating roll 23, there is a sprocket wheel 53.This sprocket wheel 53 is driven by 'a sprocket chain 54 running over asprocket wheel 55 on the shaft 56 mounted in suitable bearings 57, 57carried by the supporting table 2. The shaft 56 is in turn driven by asprocket chain 58 which meshes with a sprocket wheel 59 on the mainshaft 16. This coating roll 23 is rotated in a clockwise direction asviewed from the receiving end of the machine so that the mate rial isscraped off from the roll on to the upper face of the cover as it passesthrough the machine, the cover, of course, being placed in the machine,bottom side up, that is, the groove which makes contact with the cambody is up. The coating roll 22 is driven by a sprocket wheel 60 withwhich a sprocket chain 61 cooperates, and this sprocket chain runs overa sprocket wheel on a shaft 62 (see Fig. 1). The shaft 62 carries abevel gear wheel 63 meshing with a bevel ear wheel 64 which in turnmeshes with a lievel gear wheel 65 carried by a shaft 66. This shaftcarries a sprocket wheel on its outer end which is driven by a sprocketchain 67 and the sprocket chain 67 meshes with a sprocket wheel 68 onthe shaft 56. Through the bevel gears 68, 64 and 65, the shaft carryingthe coating roll 22 is caused to rotate in an opposite direction fromthe shaft carrying the coatlng roll 23, so that the coating roll 22rotates in a counter clockwise direction as viewed from the receivingend of the machine. These bevel. gears 63, 64 and 65 are all in rear ofthe bracket 8 and are hidden thereby on Fig. 2 of the drawings. Thesupporting plate 20 is supported and strengthened throughout the centralportion thereof where the cover is subjected to the frictional scrapingcontact with the rolls by means of vertical webs 69 which are bolted bymeans of bolts 70 to the trough for the coating material.

After the cover leaves the coating roll, it passes between vertically.extending guiding flanges 71 and '72 (see Fig. 1). The receiving end ofthese flanges are bent outwardly so as to insure-the cover passingtherebetween. The flanges are preferably made integral with the slottedsupporting plate '20. When the cover reaches the position indicated at Cin Fig. 1, it is then cen-- trally'positioned over the conveyor 73 whichis in the form of a sprocket chain having spaced fingers 74, 74: adaptedto engage the can cover and move the same through the remaining portionof the machine. This sprocket chain 7 3 moves in a plane at right anglesto the plane of the sprocket chain 3. Said sprocket chain runs over asprocket wheel 75 carried by the shaft 12 and is driven thereby. Thesprocket chain 3 tcrminates so that when the fingers 21, which are moreor less curved on their outer ends, re lease the covers by the movementof the lingers downwardly following the path of travel of the sprocketchain, the cover is properly positioned for the conveyor 73 to take itup and move it in the opposite direction and the conveyor 73 is so timedthat the fingers 74; pick up the cover at once and move it in adirection at right angles o its first path of travel so that the covertravels practically continuously through the machine. There is a guidingflange 76 which insures that the endwise movement of the cover afterleaving the chain 3 will stop and be properly positioned on theconveying chain 73,'and this guiding flange, together with the flange72, which also eX- tends around in a direction at right angles to itsfirst location, guides the cover in its forward movement-to'the secondpair of coatirg rolls indicated at 77 and 7 8. These rolls 77 and 7 8are similar in all details of construction to the rolls 22 and 23, andthey are similarly mounted, and therefore, only a brief reference to therolls will be made.

Each roll is preferably provided with annular groove 7 9. The roll 77 iscarried by a shaft 80 and the roll 7 8 is carried by a shaft 81. Theshaft 80 is mounted in brackets 82, 82, while the shaft 81 is mounted inbrackets 83, 83. These bracketsare'slotted so as to permit the shaftstomove hori v zontally and the coating rolls'back' and forth in ahorizontal plane in the manner 'de'- scribed in connection with therolls2 2 and,

23. Springs 84, and 85, 8 5 operate to yieldingly press the rolls towardthe center of the machine. Underneatheach roll there is a trough 86supported by means of a bolt- 87, each trough resting upon a lug 88 hav-7 T4. Said slotted plate has downwardly turned flanges 90 along the'slotfor strengthening the plate and also downwardly turned flanges orchannel inembers91 which are bolted by means of bolts 92 to the troughsfor the coating material, as above described in connection with thesupporting flange 69; The coating roll 77 isdriv'en by a sprocket wheel93 with which the sprocket chain 94' cooperates, and this sprocket chainruns over a sprocket wheel on the shaft 95 carrying the bevel gear 64.The coating roll 78 is driven by means of a sprocket chain 96 whichcooperates with a sprocket wheel on the shaft 97. This shaft 97 carriesa bevel gear 98 which meshes with a bevel gear 99 on the shaft 56.Associated with the coat ing rolls 77 and F8 are scrapers or doctors100, which are similar in construction and similarly mounted, to thescrapers 49.

After the can cover reaches the position indicated at C, it then travelssidewiseinstead of endwise so that the ends are presented to the coatingrolls T7 and 78., The rounded corners engage the rolls at the points a,a, which is substantially the mid dle point of the rounded corners, thenthe rolls separate so that the straight ends are coated and finally theremaining sections of the rear rounded corners engage the rear taperedends of the rolls. These tapered ends at the receiving ends of therollsare i11 dicated at 101 and at the deliveryend at 102. While I have shownthese rolls 77 and 78 as provided with annular grooves, it will beunderstood that these rolls may bemodified as to form and shaping in themanner stated.

above in connection with the coating rolls 22 and 23.

From the above it" will be apparent that I have provided a coatingmachine for a cover, for what'is known in the trade asan oblong boxhaving rounded corners wherein the cover travels substantiallycontinuously through the machine and wherein the coating is put on tothe cover at the sides and end edges and also at therounded corners. byscraping as distinguished from squirting,

it on as ha's lieretofore been practiced, and

' also as distinguished from puttingthecoating on by a roller whichtravels along the eam bottom of the groove, another method of coatingthis type of can coverl J The coating 'material is, of course, in a veryplastic condition, and substantially a fluid condition, and there isany's'light gap at the center of the rounded corners that does notcontact with; the r0lls,. the material will readily flow to ,fill llpthis gap. By scraping the material on to the cover,.it is obvious thatany amount of ,material may be put on to the cover desired, the amountbeing regulated by the thickness of the film on the coating rolls, thelength of the coating rolls and'the presence'or absence of annular chan:nels, thus increasing or decreasing as desired,the extent of'th'ecoating surface. It is not thought that further description of andportions of the rounded corners are like wise coated. The cover thenchanges its path of travel and moves in a direction at right angles tothe path of travel when the side edges are coated, and the end edges arepresented to a pair of coating rolls where they are coated by scrapingthe material thereon and the remaining sections of tlleflOLlllClGtlcorners are likewise coated by these rolls. The cover then passes out ofthe machine. Particular attention is called to the fact that the coversare continuously moving or substantially so, through the machine, whichgreatly increases the speed with which covers may be coated.

lVhile I have described my machine as operating' to coat a cover havingstraight edge portions and rounded corners, it will be understood, ofcourse, that the same principles described above may be used for coatingan oval cover, that is, a cover wherein the side and end edges insteadof being straight, are curved.

It is'obvious that minor changes in the details of construction and thearrangement of the part smay be made without departing from the spiritof the invention as set forth in the appended claims.

Having thus described the invention, what I'cla'im as new and desire tosecure by Letters Patent, is

l. A machine for coating with sealing material'can covers havingstraight edge portions and rounded'corner portions including incombination devices for engaging ,thes'traight and rounded edge portionsof the cover in succession, and means for the device is necessary. Itmay be stated,

conveying the covers bodily between said devices whereby the sealingmaterial is scraped from the devices on to the cover.

2. A machine for coating with sealing material can covers havingstraight edge portions and rounded corner portions including incombination devices for engaging the straight and rounded edge portionsof the cover in succession, and means for conveying the coverhorizontally with the face thereof to be coated uppermost between saiddevices whereby the sealing material is scraped from said devices on tosaid cover.

3. A machine for coating with sealing material can covers'havingstraight edge portions and rounded corner portions including incombination coating rolls spaced from each other and constructedandarranged so as to engage simultaneously the opposite straight androunded corner portions of the cover, and means for conveying the coverbetween said rolls whereby the sealing material is scraped from therolls on to the cover.

4:. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions, including incombination means for conveying the cover horizontally with the surfaceto be coated uppermost, coating rolls arranged in pairs and having theiraxes located substantially in the plane of travel of the cover, saidcoating rolls being shaped so'as to engage the straight and rounded edgeportions of the cover whereby the sealing material is scraped from saidrolls on to the cover.

5. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions, including incombination two pairs of coating rolls disposed with their axes at anangle to each other, conveying means for presenting the cover to thesurface tobe coated uppermost, first, to one pair of rolls and then theother pair of rolls, whereby the sides, ends and rounded cornerportionsare presented to said rolls and the sealing ma terial scraped by thecover from the rolls on to the cover.

6. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination two pairs of coating rolls arranged with their axes at rightangles to each other, means for yieldingly mounting certain of saidrolls, means for presenting the cover with its surface to be coateduppermost, first to one pair of rolls and then to the other, whereby thesides and part of the rounded end portions will be coated by one pair ofrolls and the end and remaining rounded portions will be coated by theother pair of rolls.

7. A machine for coating with sealing scraped on to the side, ends androunded corner portions of the cover from said rolls.

8. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination two pairs of coating rolls arranged with their axes at anangle, means for conveying the cover, first between one pair of rollsand then between the other pair of rolls, said cover traveling in aplane containing the axes of the rolls and with its face to be coateduppermost, means for rotating the rolls of each pair in oppositedirections so that the material on the rolls will be scraped on to thesurface of the cover to be coated, and means for supporting the rollswhereby they are yieldingly pressed against the edges of the cover.

9. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination two pairs of coating rolls arranged with their axes at anangle, means for conveying the cover, first between one pair of rollsand then between the other pair of rolls, said cover traveling in aplane containing the axes of the rolls and with its faceto be coateduppermost, means for rotating the rolls of each pair in oppositedirections so that the material on the rolls will be scraped on to thesurface of the cover to be coated, means for supporting the rollswhereby they are yieldingly pressed against the edges of the cover meansfor supplying each coating roll with a thin film of sealing material,and means whereby the thickness of the film may be regulated.

10. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination a coating roll, means for presenting a side edge and aportion of the rounded corners at the ends thereof to said roll, meanswhereby the roll is yieldingly pressed into engagement with the cancover, said cover traveling in a plane containing the axis of the roll,means for supplying said roll with coating material, and means wherebythe thickness of the material on the coating roll may be regulated.

11. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination a coating roll, means coating roll having a material, cancovers having straight edge portions and rounded corner portionsincluding in combination a coating roll, a support for can coversextending lengthwise or the roll and disposed. in a plane substantiallycontaining the axis of the roll, means for moving the cover along thesupport and longitudinally of the roll with its edge in contact with theroll, means for yieldingly pressing the cover into contact with theroll, means for rotating the roll, means for supplying the roll with acoating of sealing material, and means for regulating the thickness ofthe layer of sealing material on the coating roll, saidcoating rollhaving a series of annular grooves formed therein thus forming a seriesof separated and independent annular coating faces.

13. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination a coating roll, a support for can covers extendinglengthwise of the roll and disposed in a plane substantially containingthe axis of the roll, means for moving the cover along the support andlongitudinally of the roll with its edge in contact with the roll, meansfor yieldingly pressing the cover into contact with the roll, means forrotating the roll, means for supplying the roll with a coating 0tsealing material, and means for regulating the thickness of the layer ofsealing material on the coating roll, saidv roll being shapedlongitudinally so as to engage first, a portion of one roundedcorner,then a side edge, and: then. a portion of the'other rounded corner.

14:. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination a pair ofsupporting rolls, a support located between therolls and disposed in a plane containing the axes of the rolls, meansfor conveying the cover longitudinally of said rolls along said support,means for supporting said rolls whereby they are yieldingly pressed.toward the cover and held in contact therewith, said rolls being heldseparated by the cover, said rolls being longitudinally shaped wherebysubstantially halfof thelrounded corner pon tions at one end of thecover will engage the rolls first, then the straight side portions willengage the rolls, then substantially onehalf of the rounded cornerportions at the other end of the cover will engage the rolls forscrapingsealing material on to the cover,

means for rotating the rolls in opposite directions so as to scrape thematerial on to the upper face of the cover, and means for supplying therolls with sealing material.

15. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination a pair of supporting rolls, a support located between therolls and disposed in a plane containing the axes of the rolls, meansfor conveying the cover longitudinally of said rolls along said support,means for supporting said rolls whereby they are yieldingly pressedtoward the cover and held in contact therewith, said rolls being heldseparated by the cover, said rolls being longitudinally shaped wherebysubstantially half of the rounded corner portions at one end of thecover will engage the rolls first, then the straight side portions willengage the rolls, then substantially onehalf of the rounded cornerportions at the other end of the cover will engage the rolls forscraping sealing materialon to the cover, means for rotating the rollsin opposite directions so as to scrape the material on to the upper faceof the cover, means for supplying the rolls with sealing material, asecond pair of coating rolls shaped longitudinally and positioned so asto engage, first the remaining rounded .cornerportions at one side ofthe cover, then the end portions of the cover, then the remainingrounded portions at the other side of thecover for scraping sealingmaterial on to the cover, means for yieldingly pressing said rolls intocontact with said cover, means for rotating said second pair of rolls inopposite directions, and means for applying sealing material to saidrolls. r

16. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination two pairs of coating rolls arranged with their axes at rightangles to each other, supporting means along which the covers may slidedisposed. substantially in a plane containing the axes of the rolls,means for conveying the cover longitudinally of" one pair of rolls,means t'or conveyi'ng they cover longitudinally of the other pair ofrolls, means for yieldingly supportmg each roll: whereby they arepressed against the edge portions ofthe cover as it passestherebetween,each ofsaid rolls having acentral cylindrical portion and tapered endportions wherebythe rounded corner portions as well as the side and endportions will be coated with sealing material, means for supplying eachroll with coating material, and means for regulating the thickness ofthe coating on the rolls.

17. A machine for coating with sealing material, can covers havingstraight edge portions and rounded corner portions including incombination two pairs of coating rolls arranged with their axes at rightangles to each other, supporting means along which the covers may slidedisposed substantially in a plane containing the axes of the rolls,means for conveying the cover longitudinally of one pair of rolls, meansfor conveying the cover longitudinally of the other pair of rolls, meansfor yieldingly sup-porting each roll whereby they are pressed againstthe edge portions of the cover as it passes therebetweemeach of saidrolls having a central cylindrical portion and tapered end portionswhereby the rounded corner portions as well as the side and end portionswill be coated with sealing material, means for supplying each roll withcoating material, and means for regulating the thickness of the coatingon the rolls, each roll having a plurality of annular grooves formedtherein thus forming spaced annular coating surfaces.

18. A machine for coating with sealing material, can covers including acoating roll, means for supporting said roll, means for rotating theroll, means for conveying the cover lengthwise of the rolls with itsedge portion in contact with the roll, said roll having a series ofannular grooves forming a series of spaced annular coating faces, meansfor supplying said roll with a coating of sealing material, and meansfor regulatingthe thickness of the coating.

19. A machine for coating with sealing material, can covers including incombination means for conveying the covers, and devices yieldinglymovable toward and from each other and constructed and arranged so as toengage simultaneously opposite edge portions of the cover whereby thesealing material is scraped from said devices on to said cover.

In testimony whereof, I aflix my signa ture. i

THOMAS LUOIEN TALIAFERRO.

